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general description the max3780 evaluation kit (ev kit) is an assembled demonstration board that provides easy evaluation of the max3780 quad 2.5gbps cable transceiver. the max3780 ev kit requires only a single +3.3v supply and includes an led to indicate the lock status of the max3780 plls. features fully assembled and tested +3.3v operation allows easy testing of thermal performance easy selection of operating modes evaluates: max3780 max3780 evaluation kit ________________________________________________________________ maxim integrated products 1 19-2471; rev 0; 5/02 component list for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. ordering information component suppliers designation qty description c1?21, c26?28, c31, c32, c34?49, c68, c69, c73, c79?90 57 0.1? ?0%, 10v (min) ceramic capacitors 0402 c22 1 22pf ?%, 10v (min) ceramic capacitor (0402) c23 1 0.1? ?0%, 10v (min) ceramic capacitor (0603) c24, c70, c74 3 1.0? ?0%, 10v (min) ceramic capacitors (0805) c29 1 33? ?0%, 4v (min) tantalum capacitor c30 1 2.2? ?0%, 10v (min) ceramic capacitor (0805) d1 1 green led t-1 package j1?38 38 smb connectors, pc mount digi-key j467-nd j44?48, j51?61 16 s m a connector s, si d e- m ount tab s digi-key j502-nd ju1, ju2, ju4, ju6, ju7 5 3-pin headers, 0.1in centers designation qty description ju1 ju4, ju6, ju7 6 shunts ju3 1 2-pin header, 0.1 in center l1, l3, l4 3 56nh inductors coilcraft 0805cs-xkbc r1 1 383 ? 1% resistor (0402) r2, r23, r25 3 0 ? 5% resistors (0402) r4, r6, r13 3 10.0k ? 1% resistors (0402) r5, r7 2 4.99k ? 1% resistors (0402) r8, r9 2 49.9 ? 1% resistors (0402) r14 r22 0 open tp2 0 open u1 1 max3780ccq 100-pin tqfp-ep u2 1 inverter digi-key 296-1106-1 or texas instruments sn74ahct04pwr vcc, gnd, tp1, tp3 4 test points none 1 max3780 ev kit circuit board, rev b none 1 max3780 ev kit data sheet none 1 max3780 data sheet part temp range ic package MAX3780EVKIT 0 c to +70 c 100 tqfp-ep* supplier phone fax avx 803-946-0690 803-626-3123 coilcraft 847-639-6400 847-639-1469 * ep = exposed pad.
evaluates: max3780 max3780 evaluation kit 2 _______________________________________________________________________________________ quick start 1) apply +3.3v to the v cc pin (j49). connect the power-supply ground to the gnd pin (j50). 2) disable system loopback by shorting the v cc side of the loopen jumper. 3) set lvds outputs for normal operation by shorting the vcc side of trien . 4) apply 2.5gbps data to the rx4 inputs. if possible, apply 2.5gbps data to all rx1 to rx4 inputs. 5) apply a 125mhz reference clock to the refclk inputs. 6) apply 1.25gbps lvds data to the tdat1 and tdat2 inputs. 7) apply a 625mhz input clock to the tclk inputs. the phase drift between tclk and refclk must be < 800ps after reset. for more information, refer to the max3780 data sheet. 8) briefly short the gnd side of the reset jumper. move the short to the v cc side. 9) the lock led should light, indicating that the transmitter and receiver are in lock. 10) the demultiplexed data from rx4 should be pre- sent at the rdat7 and rdat8 outputs, with the recovered 625mhz clock at the rclk outputs. 11) the data applied at the tdat1 and tdat2 inputs should be multiplexed and present at the tx1 outputs. detailed description interfacing to cml inputs and outputs all cml inputs (rx1 rx4) and outputs (tx1 tx4) on the max3780 are ac-coupled and terminated to simpli- fy connections. differential input data with between 200mv p-p and 800mv p-p (100mv p-p and 400mv p-p as measured single ended) amplitude should be applied to the cml inputs. the cml outputs are ac-coupled, allowing direct connection to 50 ? oscilloscopes. interfacing to lvds inputs and outputs the lvds outputs (rdat1 rdat8 and rclk) are ac-coupled to allow direct interfacing to 50 ? oscillo- scopes. the lvds inputs (tdat1 tdat8 and tclk) are dc-coupled. for these inputs to function properly, provide the proper ac and dc voltages. the lvds inputs require dc biasing and therefore cannot be ac- coupled. for this reason, if the lvds outputs are to be externally looped back to the lvds inputs, the ac-cou- pling capacitors on the ev board (c2 c9 and c11 c20) must be replaced with 0 ? shorts. interfacing to pecl inputs and outputs the refclk inputs of the max3780 use pecl logic. to simplify interfacing with test equipment, the evaluation board includes terminations of 50 ? to ground on each input, as well as dc-biasing resistors. the refclk inputs should be driven with a differential signal with amplitude between 620mv p-p and 1860mv p-p . terminating unused outputs if one side of a differential signal is being observed on a 50 ? oscilloscope, balance the circuit by similarly ter- minating the other output. temperature sensor the max3780 has an integrated temperature sensor to indicate the die temperature. to independently power the temperature circuit, remove the jumper from ju3 and apply 3.3v to tp3. this allows calibration of the temperature sensor. exposed-pad package the exposed-pad (ep), 100-pin tqfp incorporates fea- tures that provide a low thermal resistance path for heat removal from the ic. the pad is electrical ground on the max3780 and must be soldered to the circuit board for proper thermal and electrical performance.
evaluates: max3780 max3780 evaluation kit _______________________________________________________________________________________ 3 name type header pin description v cc short for normal operation. trien (ju1) 3-pin header gnd short to put lvds outputs in high-impedance state. v cc short for normal operation. loopen (ju2) 3-pin header gnd short to enable loopback testing. v cc short for normal operation. reset (ju4) 3-pin header gnd momentarily short to reset fifo and receiver components. min sets eq2 = 1 for minimum compensation (refer to table 1 in max3780 data sheet). eq2 (ju6) 3-pin header max sets eq2 = 0 for maximum compensation (refer to table 1 in max3780 data sheet). min sets eq1 = 1 for minimum compensation (refer to table 1 in max3780 data sheet). eq1 (ju7) 3-pin header max sets eq1 = 0 for maximum compensation (refer to table 1 in max3780 data sheet). vcctemp enable (ju3) 2-pin header short to connect vcctemp to rest of board supply network. lock (d1) led d1 lights to indicate that the transmitter and receiver plls of the max3780 are in lock. tmpsens (tp1) test point when the tmpsens circuit is powered, the voltage at tp1 is proportional to the die junction temperature. ptpin (tp2) test point reserved for maxim use. vcctemp (tp3) test point with ju3 removed, the temperature-sensing circuit can be independently powered by applying +3.3v to tp3. table 1. controls, test points, and leds
evaluates: max3780 max3780 evaluation kit 4 _______________________________________________________________________________________ r22 open c29 33 m f c30 2.2 m f c32 0.1 m f vcc gnd j49 j50 j1 smb r25 0 w r2 0 w r23 0 w l3 56nh l4 56nh l1 56nh c73 0.1 m f c74 1.0 m f c31 0.1 m f c68 0.1 m f c24 1.0 m f c69 0.1 m f c70 1.0 m f vcc5 r21 open r20 open r19 open r18 open r17 open r16 open r15 open r14 open j2 smb j3 smb j4 smb j5 smb j6 smb j7 smb j8 smb j9 smb j10 smb j11 smb j12 smb j13 smb j14 smb j18 smb j17 smb j16 smb j15 smb c1 0.1 m f u2-a c22 22pf d1 led r13 10.0k w r1 383 w 2 74hco4 j59 smatab 26 vcc 27 vcc ju1 vcc1 25 24 23 21 22 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 1 2 vcc1 c2 0.1 m f c3 0.1 m f c4 0.1 m f c5 0.1 m f c6 0.1 m f c7 0.1 m f c8 0.1 m f c9 0.1 m f c10 0.1 m f c11 0.1 m f c12 0.1 m f c13 0.1 m f c14 0.1 m f c15 0.1 m f c16 0.1 m f c17 0.1 m f c18 0.1 m f c19 0.1 m f c20 0.1 m f c21 0.1 m f 28 29 30 31 32 33 34 35 36 37 99 98 97 96 95 94 93 92 91 90 89 100 vcc1 gnd trien rclk- rclk+ rdat8- rdat7- rdat8+ rdat7+ rdat6- rdat6+ rdat5- gnd rdat5+ vcc1 vcc1 rdat4- rdat4+ rdat3- rdat2- rdat3+ rdat2+ rdat1- rdat1+ vcc1 gnd rx3- rx3+ vcc3 rx4+ rx4- gnd vcc3 vcc2 rxfil gnd lock gnd tdat4+ tdat4- tdat5+ tdat5- tdat6+ tdat7+ tdat6- tdat7- tdat8+ tdat8- vcc6 gnd vcc2 vcc1 vcc1 c84 0.1 m f c26 0.1 m f c27 0.1 m f c85 0.1 m f c28 0.1 m f c34 0.1 m f j61 smatab j60 smatab j58 smatab j29 smb j30 smb j31 smb j32 smb j33 smb j34 smb j35 smb j36 smb j37 smb j38 smb c23 0.1 m f trien vcc2 vcc1 vcc max3780 u1 vcc1 figure 1. max3780 ev kit schematic (sheet 1 of 2)
evaluates: max3780 max3780 evaluation kit _______________________________________________________________________________________ 5 51 52 53 55 54 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 75 74 38 39 40 41 42 43 44 45 46 47 48 49 50 88 87 86 85 84 83 82 81 80 79 78 77 76 vcctemp tmpsens vcc6 gnd vcc3 rx1- rx1+ vcc3 rx2+ rx2- vcc3 gnd ptpin gnd eq2 eq1 gnd vcc4 tx4+ tx4- vcc4 tx3- tx3+ vcc4 vcc4 gnd tx2- tx2+ vcc4 tx1- vcc4 tx1+ gnd reset txfil vcc5 gnd refclk+ gnd refclk- vcc6 gnd tclk+ tdat1+ tclk- tdat1- tdat2+ tdat2- tdat3+ tdat3- vcc1 vcc1 vcc1 vcc1 c86 0.1 m f c35 0.1 m f c36 0.1 m f c87 0.1 m f c37 0.1 m f c38 0.1 m f c83 0.1 m f ju2 vcc1 j57 smatab j56 smatab j54 smatab j55 smatab ju6 eqen2 vcc1 vcctemp enable ju3 vcctemp tp3 tmpsens tp1 tp2 ptpin ju7 eqen1 vcc1 c79 0.1 m f vcc1 j53 smatab j52 smatab j51 smatab c39 0.1 m f c40 0.1 m f c88 0.1 m f vcc1 c41 0.1 m f c42 0.1 m f j48 smatab c89 0.1 m f vcc1 c80 0.1 m f vcc1 j47 smatab c43 0.1 m f j46 smatab c44 0.1 m f vcc1 c90 0.1 m f j45 smatab c45 0.1 m f j44 smatab c46 0.1 m f c81 0.1 m f vcc1 ju4 vcc c47 0.1 m f vcc5 r5 4.99k w r4 10.0k w r6 10.0k w r7 4.99k w r9 49.9 w r8 49.9 w vcc vcc c48 0.1 m f c49 0.1 m f j19 smb j20 smb vcc1 c82 0.1 m f j21 smb j22 smb j23 smb j24 smb j25 smb j26 smb j27 smb j28 smb max3780 u1 loopen reset loopen vcc1 figure 1. max3780 ev kit schematic (sheet 2 of 2)
evaluates: max3780 max3780 evaluation kit 6 _______________________________________________________________________________________ figure 2. max3780 ev kit component placement guide?omponent side 1.0"
evaluates: max3780 max3780 evaluation kit _______________________________________________________________________________________ 7 figure 3. max3780 ev kit pc board layout?omponent side 1.0"
evaluates: max3780 max3780 evaluation kit 8 _______________________________________________________________________________________ figure 4. max3780 ev kit pc board layout?older side 1.0"
evaluates: max3780 max3780 evaluation kit _______________________________________________________________________________________ 9 figure 5. max3780 ev kit pc board layout?ower plane 1.0"
evaluates: max3780 max3780 evaluation kit 10 ______________________________________________________________________________________ figure 6. max3780 ev kit pc board layout?round plane 1.0"
maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 11 ? 2002 maxim integrated products printed usa is a registered trademark of maxim integrated products. evaluates: max3780 max3780 evaluation kit figure 7. max3780 ev kit component placement guide?older side 1.0"

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